Two pressure boiler installation



March 15, 1932. H. PEPERKORN TWO-PRESSURE BOILER INSTALLATION Fled Deo. 5l, 1930 2 Sheets-Sheet El l,

March 15, 1932. l H, PEPERKQRN I 1,849,588

TWO-PRES SURE BOILER INSTALLATION Filed Deo. 5l, 1936 2 Sheets-Sheet 2 /n venivo/.-

Patented Mar. 15, 1932 UNITED STATES PATENT: oFFICE HEINRICH PEPERKORN, OF KASSEL-WILHELMSHOHE, GERMANY, ASSIGNOR- T0 SCHMIDTSCHE HEISSDAEEPF-GESELLSCHAFT MIT BESCHRANKTER HAFTUNG, 0F

KASSEL-WILHELMSHOI-IE, GERMANY TWO PRESSURE BOILER- INSTALLATION Application filed December 31, 1930, Serial No. 505,941, and in Germany January 2, 1930.

This invention concerns itself with two pressure boiler installations having a supplemental firing means for the low pressure seotion which lies in the path of the hot flue gases s from the iring means for the high pressure section. ln known boiler arrangements, such a supplemental firing means has the purpose of imparting additional heat to the low pressure section if in the event of heavy load on the installation, the heat from the principal tiring means is not suicient. A purpose of the invention as an improvement of such installations to the end that the low pressure section of the boiler may be operated with the supplemental tiring means while the high pressure section including its firing means is out of operation. Such an arrangement is very important, for example, in the case of marine boiler installations having only a single boiler, for in such case the ship may be maintained maneuverable even when the high pressure section is put out of operation for the purpose of eiiecting repairs.

The present invention is based principally upon the feature that the combustion chamber of the supplemental iring means lies in a portion of the flue of the principal firing means which may be closed oliU therefrom. If, in an arrangement of this character, the operation of the high pressure section of the boiler is discontinued and the combustion space of the supplemental firing means is closed oli1 from that of the principal firing means which normally serves to heat the high pressure section, it is possible to open the fire doors and make repairs on the high pressure section without drawing undesirable air into the combustion chamber of the supplemental firing means, while at the same time operating the low pressure section with the supplemental firing means.

In a particularly advantageous form of the invention, the combustion chamber of the supplemental tiring means lies between the high pressure superheater and the low pressure section of the boiler so that the high pressure superheater is heated by the suppleniental firing. By means of suitably arranged conduits with shutoff valves, low pressure steam can be passed through the high pressure superheater when the high pressure sectien is out of operation. It is consequently possible to obtain the desired superheating of the low pressure steam which is generated in amounts relatively greater than those generated during normal operation, and at the same time any possibility of damage to the high pressure superheater elements is precluded.

In the drawings, which illustrate a two pressure marin-e boiler installation by way of example, Fig. 1 is a longitudinal section through the boiler and Fig. 2 is a cross-section along linen-l1 of Fig. 1. Y

In the illustrated example of the invention, the high pressure steam boiler 1 is indirectly heated by means of a heat carrier circulating in a closed circuit. The tubes 2, which are heated from the outside, line the combustion chamber 3 of the high pressure boiler. The heating steam generated from the heat care rier in the tubes 2 rises through the tubes 4 to the heating element 5 lying in the water space of the boiler drum 1, where it gives off its heat of evaporation. The resulting condensate flows back to the interconnected water heaters 7 of the circulating system through the tubes 6. The low pressure boiler, which is heated by the hot gases from the principal firing means issuing from the combustion chamber 3, is shown as a smoke tube boiler 8. The hot gases from the combustion chamber 3 are drawn through a passageway 9, which is left open between the top 10 of the combustion chamber and the boiler wall 11, to the gas reversing chamber 12 and from thence through the tubes 18 of the low pressure boiler to the smoke box 14. The high pressure superheater is arranged in the reversing chamber, 15 denoting the saturated steam headers, 16 the superheated steam headers, and 17 the tube elements running between the headers. The header 15 is supplie-d with high pressure steam from the drum 1 through a conduit 19 provided with a shut-oil valve 18. n conduit 21 provided with a shut-olii' valve 20 leads from the header 16 to the engine. rlhe tube windings 17 of the high pressure superheater are so arranged that theyA form a tight wall 24 inside the reversing chamber 12 and constitute on one side a wall of the combustion chamber 25 for the supplemental iring, which lies between the smoke tube boiler 8 and the high pressure superheater. For the supplemental firing there are two oil burners 26 which project heat inwardly from the cross walls 28 to heat'l the combustion chamber 25. The boiler wall ll is provided with an opening 29 at the passage 9 leading from the combustion chamber 3 to the reversing chamber l2. Normally the opening 29 is closed by means of a plate 30 which may be removed, however, to enable the insertion and removal of plates 31 through the opening 29. rlhe plates 31, when in place, are supported in any convenient manner across the opening of the passageway 9 to block the same. lVhen the plates 3l are installed as shown in Fig. 1, the combustion chamber 3 of the high pressure section is closed off from the reversing chamber 12 and also from the combustion chamber 25 of the supplemental tiring means for the low pressure section.

The superheater for the low pressure steam is shown as a heated tube superheater 32 which receives low pressure steam from the boiler 8 through conduit 34 provided with shut-olf valve 33. The superheated low pressure steam passes through tube 35 into conduit 36 from whence it passes either through shut-olf valve 37 to auxiliary engines or through valve 38 to a low pressure stage of the principal engine or to other auxiliary engines. On the delivery side of valve 38 with respect to low pressure superheated steam, a conduit 40 provided with a shut-off valve 39 connects conduit 36 with the steam space of the low pressure boiler 8 thereby to enable delivery of saturated low pressure steam to conduit 36. Between the connection of conduits 36 and 40, and a shut-off valve 41 provided in conduit 36, the conduit 36 is connected to the high pressure saturated steam pipe 19 by means of lead 43 provided with shut-off valve 42. A conduit 47 having a shut-off valve 46 connects the high pressure superheated steam pipe 21 with conduit 36 at a point between the shut-off valve 41 and an additional shut-oii1 valve 45 in the conduit 36.

In normal operation the passageway 9 between the combustion chamber 3 and the reversing chamber 12 is open and the heating of both boiler sections follows when the high pressure .section is fired. The high pressure steam passes through open valves 18 and' 2O to the high pressure stage of the engine by way of the high pressure superheater. Valves 42 and 46 are closed so that there is no connection between the high pressure and low pressure steam leads. The low pressure steam passes through low pressure superheater 32 to the conduit 36. If, for any reason, a relatively great amount ot low pressure steam is used, as for instance, for driving the windlasses and auxiliary gear on a fishing steamer, the supplemental tiring means can be put in operation thereby to raise the amount of steam generated in the low pressure boiler. The supplemental tiring can also be used to create additional heat during the initial heating of the installation.

It repairs must be carried out upon the high pressure section, the fire communicating with the high pressure section is necessarily put out and the engine is driven with low pressure steam generated in the low pressure boiler which is heated by the supplemental tiring, so that the ship will remain maneuverable. rflue passageway 9 is covered by means of plates 31 so that no undesirable air is sucked into the combustion chamber 25 from the open combustion chamber 3 of the tiring means for the high pressure section. The valve 18 of the high pressure steam lead is closed and the high pressure superheater receives presuperheated steam from the low pressure superheater 32 through conduit 36, For this purpose the valve 42 in the connecting conduit 43 and the valve 46 in conduit 47 are opened whereas the valve 20 in the high pressure superheated steam conduit leading to the high pressure stage oit the engine is closed. Thelowpressuresteamwhichhasbeen additionally superheated in the high pressure superheater passes through conduits 21 and 47 back into the conduit 36 and through the open valve 45 to the low pressure stage of the engine. In this case the low pressure superheater and the high pressure superheater are connected in series. However. an arrangement in parallel can also be effected if it is desired. for instance, to pass steam issuing from the low pressure superheater to the auxiliaries and to pass low pressure steam issuing from the high pressure superheater to the principal engine. For such operation the valve 38 is closed and the valve 39 opened. The remaining valves are adjusted as described above. The steam coming from the low pressure boiler separates, part passing through conduit 34 to the low pressure superheater and part passing through conduit 4G to the high pressure superheater.

It is immaterial to the invention whether steam is generated in the high pressure drum directly or indirectly.

I claim:

1. A multi-stage boiler installation comprising a high pressure section, a low pressure section, principal firing means normally supplying` heat to both said sections, supplemental means for firing the low pressure section, the combustion space for said .supplemental iring means lying within the path of the flue gases from said principal firing means, and means for closing oil" connection between said principal tiring means and the combustion space of said supplemental firing means.

2. A multi-stage boiler installation comprising a high pressure section, a low pressure section, a principal combustion chamber normally supplying heat to both said sections, a iue leading from said principal combustion chamber, supplemental means for firing the low pressure section, the combustion space for said supplemental firing means lying in a portion of said flue, and means for closing oft' said combustion space from said principal combustion chamber.

3. A multi-stage boiler installation coinprising a high pressure section, a low pressure section, a principal combustion chamber normally supplying heat to said sections, a flue connecting the principal combustion chamber withrone of said sections, supplemental means for firing the said first section, a superheater disposed in said iue, the combustion space for said supplemental tiring means lying in a portion of said flue adjacent the superheater and the said first section, said superheater being positioned to be heated by said firing means, means for passing steam from either section through said superheater, and means for closing oii' communication between said combustion space and superheater and said principal combustion chamber, the heating elements of the second section being located on the combustion chamber side of said closing means.

4. A multi-stage boiler installation comprising a high pressure section, a low pressure section, a principal combustion chamber normally supplying heat to said sections, a ue connecting the principal combustion chamber with the low pressure section, a high pressure superheater normally in communication with the steam space of said high pressure section and disposed in said flue, supplemental means for tiring the low pressure section, the combustion space for said supplemental firing means lying in a portion of said flue between said high pressure superheater and said low pressure section, said superheater being positioned to be heated by said firing means, mea-ns for closing oli communication between said combustion space and said principal combustion chamber, and means for passing steam from the low pressure section through said high pressure superheater, the heating elements of the high pressure section being located on the combustion chamber side of said closing means, whereby said high pressure section and said principal combustion chamber may be held out of operation while said low pressure section remains in operation with said supplementary tiring means. Y

5. A multi-stage boiler installation comprising a high pressure section, a smoke tube boiler constituting a low pressure section, a principal combustion chamber normally supplying heat to said sections, a reversin chamber connected to said principal com ustion chamber, said reversing chamber communieating with said low pressure section, a high pressure superheater normally in communication with the steam space of said high pressure section and disposed in said reversing chamber, supplemental means for firing the low pressure section, the combustion space for said supplemental firing means lying in a portion of said reversing chamber between said high pressure superheater and ksaid low pressure. section, the heat receiving elements of said high pressure .superheater constituting a wall of said combustion space, means for closing 0E communication between said combustion space and the principal combustion chamber, and means for passing steam from the low pressure section through said high pressure superheater, the heating elements of the high pressure section being located on the combustion chamber side of said closing means, whereby said high pressure section and said principal combustion chamber may be held out of operation while said low pressure section remains in operation with said supplementary tiring means.

6. A structure as claimed in claim 5 wherein there is a conduit connecting the steam space of the high pressure section with the high pressure superheater, a low pressure superheater normally receiving the low'pressure steam, a shut-off valve for closing oil' communication between the steam space of the high pressure section and the high pressure superheater, and means for conducting steam from the steam space of thel low pressure section to the high pressure superheater.

In testimony whereof, I have hereunto set my signature.

HEINRICH PEPERKORN. 

